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    8 vulnerabilities by @modelcontextprotocol

    CVE-2026-111770 (GCVE-0-2026-111770)

    Vulnerability from nvd – Published: 2026-11-05 21:28 – Updated: 2026-11-05 21:44
    VLAI
    Title
    Model Context Protocol TypeScript SDK: Shared transport or server instances delivered one HTTP client's messages to another
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 2.0.0 until 2.3.0 in @modelcontextprotocol/server, applications that shared one stateless HTTP transport or one McpServer or Server instance among multiple clients could deliver responses and notifications to the wrong client. The affected surface is an MCP server reached over HTTP by multiple clients. The trigger is reuse of one stateless transport or server instance. Messages were associated with a connection using only the JSON-RPC request identifier. SDK clients start request identifiers at zero, so collisions occur in normal operation. Cross-client delivery exposes one client's responses and notifications to another client. The issue requires an HTTP endpoint reachable by more than one client and an application that constructs the server or transport once at startup instead of once per request or session. stdio servers and factory-created per-call servers are not affected. Upgrading causes reused instances to fail and therefore requires an application code change. This issue is fixed in @modelcontextprotocol/server 2.3.0.
    Severity
    7.7 (High)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-05 21:44 UTC
    CWE
    • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-111770",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-11-05T21:44:38.294653Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-11-05T21:44:49.319Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "typescript-sdk",
          "vendor": "modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.32.0"
            }
          ]
        },
        {
          "product": "server",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.3.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 2.0.0 until 2.3.0 in @modelcontextprotocol/server, applications that shared one stateless HTTP transport or one McpServer or Server instance among multiple clients could deliver responses and notifications to the wrong client. The affected surface is an MCP server reached over HTTP by multiple clients. The trigger is reuse of one stateless transport or server instance. Messages were associated with a connection using only the JSON-RPC request identifier. SDK clients start request identifiers at zero, so collisions occur in normal operation. Cross-client delivery exposes one client\u0027s responses and notifications to another client. The issue requires an HTTP endpoint reachable by more than one client and an application that constructs the server or transport once at startup instead of once per request or session. stdio servers and factory-created per-call servers are not affected. Upgrading causes reused instances to fail and therefore requires an application code change. This issue is fixed in @modelcontextprotocol/server 2.3.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-05T21:28:00.414Z",
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        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-jm63-cq47-j5jp",
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-jm63-cq47-j5jp"
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        {
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2918"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/commit/84804c22e45a662675a198f853b7f00063838a8d"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0",
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0"
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      ],
      "source": {
        "advisory": "GHSA-jm63-cq47-j5jp",
        "discovery": "UNKNOWN"
      },
      "title": "Model Context Protocol TypeScript SDK: Shared transport or server instances delivered one HTTP client\u0027s messages to another"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-111770",
    "datePublished": "2026-11-05T21:28:00.414Z",
    "dateReserved": "2026-10-16T17:52:09.082Z",
    "dateUpdated": "2026-11-05T21:44:49.319Z",
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}

    CVE-2026-111769 (GCVE-0-2026-111769)

    Vulnerability from nvd – Published: 2026-11-05 21:19 – Updated: 2026-11-05 21:19
    VLAI
    Title
    Model Context Protocol TypeScript SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
    CWE
    • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "typescript-sdk",
          "vendor": "modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.32.0"
            }
          ]
        },
        {
          "product": "sdk",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.32.0"
            }
          ]
        },
        {
          "product": "client",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.3.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-05T21:19:36.708Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
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        {
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-6prh-2h8m-c8cw"
        },
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            "x_refsource_MISC"
          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2901"
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2902",
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            "x_refsource_MISC"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2902"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/commit/30bfe5139f4b0825c90cd725f9a7e3f9af5e120d",
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            "x_refsource_MISC"
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/commit/433eb413dc305ebeb93b8ebcde0095a8fc0d5fa0"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0",
          "tags": [
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0"
        }
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      "source": {
        "advisory": "GHSA-6prh-2h8m-c8cw",
        "discovery": "UNKNOWN"
      },
      "title": "Model Context Protocol TypeScript SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-111769",
    "datePublished": "2026-11-05T21:19:36.708Z",
    "dateReserved": "2026-10-16T17:52:09.082Z",
    "dateUpdated": "2026-11-05T21:19:36.708Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-111768 (GCVE-0-2026-111768)

    Vulnerability from nvd – Published: 2026-11-05 21:22 – Updated: 2026-11-05 21:22
    VLAI
    Title
    Model Context Protocol TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.3.0 until 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, HTTP servers did not enforce a limit on the number of array elements and object keys validated in one request. The affected surface is validation of HTTP requests containing arrays or object keys. The trigger is an array-element or object-key validation workload large enough to exhaust memory while remaining within the request size limit. A single request within the default 4 MiB limit can terminate the process with JavaScript heap exhaustion. No credentials are required unless the application authenticates before SDK processing. Tools accepting arrays or records carry the greatest risk. stdio-only servers do not expose the HTTP request path. Upgrading alone does not enable the new validation bound. Operators must configure both a tool-input element bound and an appropriate request body size limit. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/server 2.3.0.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "typescript-sdk",
          "vendor": "modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.3.0, \u003c 1.32.0"
            }
          ]
        },
        {
          "product": "server",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.3.0"
            }
          ]
        },
        {
          "product": "sdk",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.3.0, \u003c 1.32.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.3.0 until 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, HTTP servers did not enforce a limit on the number of array elements and object keys validated in one request. The affected surface is validation of HTTP requests containing arrays or object keys. The trigger is an array-element or object-key validation workload large enough to exhaust memory while remaining within the request size limit. A single request within the default 4 MiB limit can terminate the process with JavaScript heap exhaustion. No credentials are required unless the application authenticates before SDK processing. Tools accepting arrays or records carry the greatest risk. stdio-only servers do not expose the HTTP request path. Upgrading alone does not enable the new validation bound. Operators must configure both a tool-input element bound and an appropriate request body size limit. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/server 2.3.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-46jr-4wx8-v453",
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-46jr-4wx8-v453"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2926",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2926"
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        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2927",
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            "x_refsource_MISC"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2927"
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766fcb66b636ca6b654e99c37",
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            "x_refsource_MISC"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766fcb66b636ca6b654e99c37"
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            "x_refsource_MISC"
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/commit/fd26801b3b387742fe24a90ed4b275dd6072209f"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0"
        },
        {
          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0"
        }
      ],
      "source": {
        "advisory": "GHSA-46jr-4wx8-v453",
        "discovery": "UNKNOWN"
      },
      "title": "Model Context Protocol TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-111768",
    "datePublished": "2026-11-05T21:22:44.119Z",
    "dateReserved": "2026-10-16T17:52:09.082Z",
    "dateUpdated": "2026-11-05T21:22:44.119Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

    CVE-2026-111771 (GCVE-0-2026-111771)

    Vulnerability from nvd – Published: 2026-11-05 21:08 – Updated: 2026-11-05 21:08
    VLAI
    Title
    Model Context Protocol TypeScript SDK: Server bearer authentication accepted tokens issued for another service
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.6.0 until 1.32.0 in @modelcontextprotocol/sdk, from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, from 2.0.0 until 2.0.2 in @modelcontextprotocol/express, and from 2.0.0 until 2.3.1 in @modelcontextprotocol/server-legacy, server-side bearer authentication could accept a valid access token issued for a different service because the SDK did not enforce the token audience. The affected surface is server-side HTTP bearer authentication. The trigger is a valid token whose audience names another service. The authorization server must issue tokens for multiple services, and the application's verifyAccessToken() must not independently validate aud. Applications already validating aud inside verifyAccessToken() are not affected. An attacker with a token for another service could authenticate to the MCP server and obtain the confidentiality and integrity capabilities granted to an authenticated caller. Upgrading alone leaves the new audience validation disabled. Operators must enable audience validation and provide the token audience together. Enabling only the expected audience check causes every request to receive HTTP 401. This issue is fixed in @modelcontextprotocol/sdk 1.32.0, @modelcontextprotocol/server 2.3.0, @modelcontextprotocol/express 2.0.2, and @modelcontextprotocol/server-legacy 2.3.1.
    Severity
    6.8 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    • CWE-863 - Incorrect Authorization
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "typescript-sdk",
          "vendor": "modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.6.0, \u003c 1.32.0"
            }
          ]
        },
        {
          "product": "sdk",
          "vendor": "@modelcontextprotocol",
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            {
              "status": "affected",
              "version": "\u003e= 1.6.0, \u003c 1.32.0"
            }
          ]
        },
        {
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          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.3.0"
            }
          ]
        },
        {
          "product": "express",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.0.2"
            }
          ]
        },
        {
          "product": "server-legacy",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.3.1"
            }
          ]
        }
      ],
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        {
          "lang": "en",
          "value": "The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.6.0 until 1.32.0 in @modelcontextprotocol/sdk, from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, from 2.0.0 until 2.0.2 in @modelcontextprotocol/express, and from 2.0.0 until 2.3.1 in @modelcontextprotocol/server-legacy, server-side bearer authentication could accept a valid access token issued for a different service because the SDK did not enforce the token audience. The affected surface is server-side HTTP bearer authentication. The trigger is a valid token whose audience names another service. The authorization server must issue tokens for multiple services, and the application\u0027s verifyAccessToken() must not independently validate aud. Applications already validating aud inside verifyAccessToken() are not affected. An attacker with a token for another service could authenticate to the MCP server and obtain the confidentiality and integrity capabilities granted to an authenticated caller. Upgrading alone leaves the new audience validation disabled. Operators must enable audience validation and provide the token audience together. Enabling only the expected audience check causes every request to receive HTTP 401. This issue is fixed in @modelcontextprotocol/sdk 1.32.0, @modelcontextprotocol/server 2.3.0, @modelcontextprotocol/express 2.0.2, and @modelcontextprotocol/server-legacy 2.3.1."
        }
      ],
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            "attackComplexity": "HIGH",
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            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
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      ],
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          "descriptions": [
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              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
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          ]
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      ],
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2930",
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2952",
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2952"
        },
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/commit/40f8f4e229d963cd7fd2890bda2aeebe7005299a",
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/commit/5a0724d14cf34a27a3b070224d2996cdd611df9f",
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/express@2.0.2",
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      "source": {
        "advisory": "GHSA-rvq5-wwqv-78pq",
        "discovery": "UNKNOWN"
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}

    CVE-2026-111770 (GCVE-0-2026-111770)

    Vulnerability from cvelistv5 – Published: 2026-11-05 21:28 – Updated: 2026-11-05 21:44
    VLAI
    Title
    Model Context Protocol TypeScript SDK: Shared transport or server instances delivered one HTTP client's messages to another
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 2.0.0 until 2.3.0 in @modelcontextprotocol/server, applications that shared one stateless HTTP transport or one McpServer or Server instance among multiple clients could deliver responses and notifications to the wrong client. The affected surface is an MCP server reached over HTTP by multiple clients. The trigger is reuse of one stateless transport or server instance. Messages were associated with a connection using only the JSON-RPC request identifier. SDK clients start request identifiers at zero, so collisions occur in normal operation. Cross-client delivery exposes one client's responses and notifications to another client. The issue requires an HTTP endpoint reachable by more than one client and an application that constructs the server or transport once at startup instead of once per request or session. stdio servers and factory-created per-call servers are not affected. Upgrading causes reused instances to fail and therefore requires an application code change. This issue is fixed in @modelcontextprotocol/server 2.3.0.
    Severity
    7.7 (High)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-11-05 21:44 UTC
    CWE
    • CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
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                "id": "CVE-2026-111770",
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-jm63-cq47-j5jp"
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    CVE-2026-111768 (GCVE-0-2026-111768)

    Vulnerability from cvelistv5 – Published: 2026-11-05 21:22 – Updated: 2026-11-05 21:22
    VLAI
    Title
    Model Context Protocol TypeScript SDK: One HTTP request within the default size limit could exhaust server memory during validation
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.3.0 until 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, HTTP servers did not enforce a limit on the number of array elements and object keys validated in one request. The affected surface is validation of HTTP requests containing arrays or object keys. The trigger is an array-element or object-key validation workload large enough to exhaust memory while remaining within the request size limit. A single request within the default 4 MiB limit can terminate the process with JavaScript heap exhaustion. No credentials are required unless the application authenticates before SDK processing. Tools accepting arrays or records carry the greatest risk. stdio-only servers do not expose the HTTP request path. Upgrading alone does not enable the new validation bound. Operators must configure both a tool-input element bound and an appropriate request body size limit. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/server 2.3.0.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
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          "vendor": "modelcontextprotocol",
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-46jr-4wx8-v453"
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2926",
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2927"
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/commit/6d8dbc6cb590edf766fcb66b636ca6b654e99c37",
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    CVE-2026-111769 (GCVE-0-2026-111769)

    Vulnerability from cvelistv5 – Published: 2026-11-05 21:19 – Updated: 2026-11-05 21:19
    VLAI
    Title
    Model Context Protocol TypeScript SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0.
    Severity
    6.5 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
    CWE
    • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
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      "affected": [
        {
          "product": "typescript-sdk",
          "vendor": "modelcontextprotocol",
          "versions": [
            {
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        },
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          "vendor": "@modelcontextprotocol",
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            {
              "status": "affected",
              "version": "\u003c 1.32.0"
            }
          ]
        },
        {
          "product": "client",
          "vendor": "@modelcontextprotocol",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.3.0"
            }
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. Prior to 1.32.0 in @modelcontextprotocol/sdk and from 2.0.0 until 2.3.0 in @modelcontextprotocol/client, the HTTP client transports and OAuth client requests followed redirects to a different origin while retaining custom request headers and, for HTTP 307 or 308 responses, request bodies. The affected surfaces are StreamableHTTPClientTransport, SSEClientTransport, and OAuth client functions such as auth(). The trigger is an HTTP redirect to another origin. Custom headers and mcp-session-id can be re-sent to the redirected origin. HTTP 307 and 308 redirects can also re-send the request body. OAuth request bodies can contain refresh_token and client_secret values. Current runtimes already strip the Authorization header across origins. stdio clients do not use the affected HTTP path. A malicious or compromised MCP or authorization server could therefore receive API keys, session identifiers, OAuth refresh tokens, or OAuth client secrets. Restoring unrestricted redirect following after upgrading restores the exposure. This issue is fixed in @modelcontextprotocol/sdk 1.32.0 and @modelcontextprotocol/client 2.3.0."
        }
      ],
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        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/pull/2902"
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/commit/30bfe5139f4b0825c90cd725f9a7e3f9af5e120d",
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/1.32.0",
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0",
          "tags": [
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          ],
          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/server@2.3.0"
        }
      ],
      "source": {
        "advisory": "GHSA-6prh-2h8m-c8cw",
        "discovery": "UNKNOWN"
      },
      "title": "Model Context Protocol TypeScript SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-111769",
    "datePublished": "2026-11-05T21:19:36.708Z",
    "dateReserved": "2026-10-16T17:52:09.082Z",
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    CVE-2026-111771 (GCVE-0-2026-111771)

    Vulnerability from cvelistv5 – Published: 2026-11-05 21:08 – Updated: 2026-11-05 21:08
    VLAI
    Title
    Model Context Protocol TypeScript SDK: Server bearer authentication accepted tokens issued for another service
    Summary
    The Model Context Protocol TypeScript SDK provides TypeScript client and server implementations of the Model Context Protocol. From 1.6.0 until 1.32.0 in @modelcontextprotocol/sdk, from 2.0.0 until 2.3.0 in @modelcontextprotocol/server, from 2.0.0 until 2.0.2 in @modelcontextprotocol/express, and from 2.0.0 until 2.3.1 in @modelcontextprotocol/server-legacy, server-side bearer authentication could accept a valid access token issued for a different service because the SDK did not enforce the token audience. The affected surface is server-side HTTP bearer authentication. The trigger is a valid token whose audience names another service. The authorization server must issue tokens for multiple services, and the application's verifyAccessToken() must not independently validate aud. Applications already validating aud inside verifyAccessToken() are not affected. An attacker with a token for another service could authenticate to the MCP server and obtain the confidentiality and integrity capabilities granted to an authenticated caller. Upgrading alone leaves the new audience validation disabled. Operators must enable audience validation and provide the token audience together. Enabling only the expected audience check causes every request to receive HTTP 401. This issue is fixed in @modelcontextprotocol/sdk 1.32.0, @modelcontextprotocol/server 2.3.0, @modelcontextprotocol/express 2.0.2, and @modelcontextprotocol/server-legacy 2.3.1.
    Severity
    6.8 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
    CWE
    • CWE-863 - Incorrect Authorization
    Assigner
    GitHub_M CNA under the mitre root
    CNA scorecard C 72/100 over 8026 records in the last 180 days details
    References
    Impacted products
    Show details on NVD website
    To clipboard 

    {
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          "product": "server-legacy",
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        }
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
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          "name": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/express@2.0.2",
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          "url": "https://github.com/modelcontextprotocol/typescript-sdk/releases/tag/@modelcontextprotocol/express@2.0.2"
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